zaibatsu Syllabification: (zai·ba·tsu)Pronunciation: /zīˈbätˌso͞o, -ˈbat-/Definition of zaibatsu noun (plural same) a large Japanese business conglomerate. Origin:Japanese, from zai 'wealth' + batsu 'clique'zaibatsu in other Oxford dictionaries Definition of zaibatsu in the British & World English dictionary